Just holding Nasdaq 100 ETFs is enough? People get impressed by "doubled my money" but forget that the most important question is - how much time did it take? Even a super safe asset with 3% returns will double your money... in 24 years.

7%+ per year?

https://www.invesco.com/qqq-etf/en/performance.html

Nasdaq 100 -> 4.5x your money in 10y

S&P 500 -> 2.5x your money in 10y